﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace text1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
               float op1,op2;
        float result=0;
        char opt;
        op1 = Single.Parse(textBox1.Text);
         op2 = Single.Parse(textBox2.Text);
         opt = char.Parse(comboBox1.Text);
        switch(opt)
        { 
            case '+':
            result=op1+op2;
            break;
            case '-':
            result=op1-op2;
            break;
            case '*':
            result=op1*op2;

            break;
            case '/':
            result=op1/op2;
            break;
        default:
             MessageBox.Show("请选择算术运算符号");
             break;
         }
        textBox3.Text = result.ToString();
}

        private void button2_Click(object sender, EventArgs e)
        {
           
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
            comboBox1.Text = "";

        }

        }
    }

